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In the compound given below: the correct...

In the compound given below: the correct order of acidity of the positions

(X), (Y) and (Z) is :

A

(Z) gt (X) gt (Y)

B

(X) gt (Y) gt (Z)

C

(X) gt (Z) gt (Y)

D

(Y) gt (X) gt (Z)

Text Solution

Verified by Experts

The correct Answer is:
C
`X gt Z gt Y`
`pK_a` value of carboxylic group is less than `pK_a` of `-overset(+)NH_3` ("Y") in amino acid and `-overset+NH_3` ("Z") will have comparatively less `pK_a` than `-overset(+)NH_3` ("Y") due to - I effect of carboxylate group.
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